Abrasive wheel.



A. L. HULL,

ABRASIVE WHEEL.

APPLIGAUON FILED Imm-3,1912.

1,063,688. Patented June 3, 1913.

2 SHEETS-SHEET 1.

A. L. HULL.

ABRASIVE WHEEL.

APPLICATION FILED fnB.19,1912,

1,063,688, Patented June 3, 1913.

2 SHEETS-SHEET 2.

\/\/ EEEEE. Ev-ETT- by At-' tirarmi) erariie ra. eier orriori.

ABBHAM L. HULL- 0F VALPARAISQ, INDIANA.

ABRAeIvE WHEEL.

-to the accompanyingdrawings, and to the numbers of reference marked' iereon, which A form a part of this Specification.

r.[his invention relates more particularly to that class of abrasive wheels sometimes called 'cup einery wheels ,in which there is a relatively thin inner portion of the Wlieele and a relatively thick peripheral portion formed up substantially at a right angle with the web or back. Owingito the inA creased thickness and Weight of the periphery of such wheels, and the high velocity at which they are driven, considerable ditheiilty lia-s heretofore been experiei'ieed in so eon-l structing the wheels as to afford adequate strength for resistingr the centrifugal force due. to the velocity or rotation,v and which, if'the wheel is not sufficiently strong, causes the Wheel to break when in nee, greatly endangering the workman. Although -at- Vtempts, lhave sometimes: been made in the const ructionof such Wheels, to afford a reinforcing' web or core, jsnch web or Core has been Worthless after the wheel has been Worn down somewhat, and has been thrown laway :as refuse, thus causing a ooneiderable wast-e 'and adding iinii'essarily 'to the expense en,- tail'ed uponvthose who would use the same.

The object of thisinvention is to afford a construe-tion for the piiryiosespeeied, Y affording` such strength as, to preclude the bursting of the W-liecl through centrifugal action and enabling t-he entire grinding surface of the wheel to be used untilthe wheel is usedup and affording also a construction -iii which the core or web of the wheel .may

be again used for any number of times in the building up of other wheels by the newal of the abrasive material thereon.

Y It is also an object of the invention to afforda construction whereby either a single 'oia double cu )abrasive wheel may be ai?- forded, as pre erred. and in which the ut- Specication of Letters Patent.

iseiited June 3, 1913.

Appiicaii'on fiied February i9, wiz. serial No. 678,671.

most economy. in eoiietruetioii and renewal,

and entire safety to the operator from the bureting of the `wheel, is attained.

The invention, in its preferred form, is

.illustrati-i in the drawings, and is herein'- ict-er more fully deseiil'ied.

ln the drawings: Figure l isa rea-r elevation or va face wheel embodying my invention, with the backing plate broken away.A

section thereof on line 2 2 of Fig. 2 is a F l, showing the snaftin elevation.v Fig.

3 a fragmentary section. taken on line. 3 -3 of Fig. 1. Fig'. ft is a fragmentary section taken on line lL-44 of Fig. 1. Fig. 5 isla' view in front elevation of tfhedoilble emp Wheel embodying' my invention, with the abrasive riin partly broken away and in sect.' n to illiietrate kthe cimstruetio-n. Fig. 6 is a section on line of Fig. 5. Fig. 7 is a sect ion on line "4" of Fig. V`Fig. 8 is a section similar to Fie. biitshowin a single eiip Wheel, with thearbor extended and a init threaded thereon.

As shown in the drawings: l, indicates the elia t or arbor l'iaviner a collar 2, shrunk or' otherwise i diy Secured' thereon, and

which reduced atI its ends slight-ly to aftord a solid shoulder in the plane of the sive material is secured.

about the Shaft aperture therethrough, with apertures to receive screws 4, whereby said inet-allie Web is rigidly secured andthereby centered unon the shaft-' The web 3, shown in '(whie illust-rate a face Wheel) is provided with large sized. apertures A, therethrough,

to the collar,V

-outer face-'of the collar, againstwhieh abuts -t-he metallic -web upon which the abra? .y

Said web is pro-- vided in close 'proximity with, and arranged ige l to 4 i-nelus-ivei: I

as Shown, circular in form, tlieonter edges f ot' which extend to near, or may be out.

through the periphery of the web. AS Shown in dotted lines in.l Fig. 1, and i-n 'full lines in Figs. 2 to 4. inclusive, saidapert-ures are eountersnnk. on the rear side ofthe'plate to afford outwardly and rearwardly inclined sides to said aperture. Arranged between said apertures, and near or at the periphery of said. plate, are smaller apertures B, Which are also counters-.ink in the manner before described, so that the abrasive material 7, of

whatsoever kind, when molded onsaid plat-e,

. of the web on which the Afor the wheel and acts to hold the material is in effect dove-tailed thereinto. A backing plate 5, which may be metallic and relatively thin, is secured by means of`screws G, on said web plate 3, and affords the back in said apertures from being pressed outwardly when the abrasive face 7, has been worn thin or close down to the web.

In the construction illustrated in Figs. 5 to 8 inclusive, the web'S, (which is for a double cup Wheel) is secured upon the arbor as before described, and is provided about its periphery with closely arranged aper-y tures, which, as shown, cut through the'periphery to afford outwardly opening notches, said opening through the periphery pre-ferably in each instance being of less length than the diameter' of the aperture. Where a double lcup wheel is required, as illustrated in Figslf, 6, and 7, these apertures are countersunk on both sides inwardly to. enable the abrasive material 9, to bind thereon, the metal of said web between said apertures projecting outwardly thereinto, .as shown in Figs. 5 and 7, and affording vsubstantially peripheral pins l0, which taper from their outer extremities inwardly to the web and are substantially rectangular or diamond shaped in cross section, as illustrated in Fig. 7,Y to bond the abrasive material thereon. In this construction, the abrasive material is molded on the web to adi/Td a raised grinding surface on each side of the web or near the periphery, and a suticient amount. of said abrasive material covering said pins or projections l0, to a depth dependent upon whether the edge face of the wheel is to be used for grinding or not, this thickness, ofcourse, serving to protect the article ground on said Wheel from contact with any portion of the web in grinding.

The single cup wheel illustrated in Fig. 8, may be molded upon a web 1l, substantially identical in construction with the Web- 8, shown in Fig. 5, in all particulars excepting, of course, inasmuch as a grinding face or cup is requireiupon but one side of the wheel,.the'rhountersinking of the apertures in the web for bonding the material the l on is provided from the rear side oft e plate only, and a backing plate or ring 12, (preferably metallic) is secured to the plate or otherwise rigidly secured thereto Substantially as before described with reference to the face' wheel shown in Figs. 1 tot inclusive, and for thefsame purpose.

In operation, the Wheel' is used, of course, as other Wheel-s for a similar purpose are used, although, owing to the extreme rigidity abrasive surface is molded, and the large amount of material bonded in Said web, any desired pressure l in grinding may be applied to the Wheel, or l the wheel may be driven at any desired rate of speed without danger o1 breaking. Furthermore, owing to the construction de' scribed, the Wheel` whether a face Wheel, a single cup, or a double cup wheel, may be used Without ditliculty or danger untilthe abrasive material is-worn to the web, for the1 backing plate supports the bonded abrasive material in the apertures in the web, whilethe double countersink in the double cup wheel adequately supports the bonded material from pushing out of the apertures, at least untilt-he material is worn to the web. VV-hen the abrasive material is Worn away tol renderv the wheel undesirable for further use, the Webs and backing plates are utilized by molding otherabrasive material thereon, hence the initial expense for said webs, inl View of their long period of use, each to afford many wheels, .may be considered as negligible. Of course, it is to be unde'f stood that the Aparticular arrangement-.and shapes of the `apertures in said Webs,nd the countersinkling thereo the material of which` said YWebs may be composed, 'as well as the backing plates (if any are used)."1nayV vary through a Wide range, dependent upon the use to which the wheel is to be put. I have illustrated and described but apre- .fel

erred construction embodying my inven tion. I therefore do notvpurpose' limiting'v the patent to be granted on this application otherwise than necessitated by the prior art.

I. claim as my invention: 1. A device of the class described-embracinga metallic pla-te or web having apertures, some closelyarranged therethrough intersectin'g the peripheryv thereofand others spaced within'the periphery and shaped to Wedgingly engage material molded therein, and abrasive material molded on said plate and filling said apertures and affording a raised petlipheral rim on one or both sides I' said plate'.

2. A device of the class described embracing a circular metallic flat web or plate hav.- ing a central shaft aperture therethrough, and provided with apertures `arranged around and opening through the periphery thereof, saidop'ening through the periphery having less length than the diameter of the apertures, said plate countersunk on om` or both sides at eac-h aperture to rigidly engage material bonded therein, and an abrasive rim molded on said plate or web on one or bot-h sides thereof and extendingl beyond and covering the peripheryof said plate or web.

3. A device of the class described em bracing a. Hat plate or web npertured for centering upon a'shaft, and apertured adjacent the center to receive screws for` engaging the same upon a collar secured on such shaft, closely' arranged, flat outwardly flaring pin,q integrai with said plate at its periphery and affording therebetween notches or recesses l scribed my name in the presence of two sub wider between the teeth approximately at scribing Witnesses.

their middle than at the outer endsI of the teeth, and a rim of abrasive material molded ABRAHAM L HULL" around and on the periphery of said web und bonded in Said notches and Gn said pins, i In testimony whereof I have hereunto sub g Witnesses:

CHARLES Vv'. HILLS7 Jr., GEORGE R. MOORE. 

